Tractor



FIG. 1 is a drawing of a front elevational view of a tractor of the present design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a top/front/left perspective view thereof; and,

FIG. 7 is a top/rear/left perspective view thereof.

The bottom view forms no part of the claimed design. The drawings include surface shading that represents contour and not surface ornamentation. 

CLAIM We claim the ornamental design for a tractor, as shown and described. 